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#include <QtWidgets>

#include "flowlayout.h"
#include "QLayoutItem"
#include "logger.h"
namespace wl {

//! [1]
    FlowLayout::FlowLayout(QWidget *parent, int margin, int hSpacing, int vSpacing)
            : QLayout(parent), m_hSpace(hSpacing), m_vSpace(vSpacing) {
        setContentsMargins(margin, margin, margin, margin);
    }

    FlowLayout::FlowLayout(int margin, int hSpacing, int vSpacing)
            : m_hSpace(hSpacing), m_vSpace(vSpacing) {
        setContentsMargins(margin, margin, margin, margin);
    }
//! [1]

//! [2]
    FlowLayout::~FlowLayout() {
        QLayoutItem *item;
        while ((item = takeAt(0)))
            delete item;
    }
//! [2]

//! [3]
    void FlowLayout::addItem(QLayoutItem *item) {
        itemList.append(item);
    }
//! [3]

//! [4]
    int FlowLayout::horizontalSpacing() const {
        if (m_hSpace >= 0) {
            return m_hSpace;
        } else {
            return smartSpacing(QStyle::PM_LayoutHorizontalSpacing);
        }
    }

    int FlowLayout::verticalSpacing() const {
        if (m_vSpace >= 0) {
            return m_vSpace;
        } else {
            return smartSpacing(QStyle::PM_LayoutVerticalSpacing);
        }
    }
//! [4]

//! [5]
    int FlowLayout::count() const {
        return itemList.size();
    }

    QLayoutItem *FlowLayout::itemAt(int index) const {
        return itemList.value(index);
    }

    QLayoutItem *FlowLayout::takeAt(int index) {
        if (index >= 0 && index < itemList.size())
            return itemList.takeAt(index);
        return nullptr;
    }
//! [5]

//! [6]
    Qt::Orientations FlowLayout::expandingDirections() const {
        return 0;
    }
//! [6]

//! [7]
    bool FlowLayout::hasHeightForWidth() const {
        return true;
    }

    int FlowLayout::heightForWidth(int width) const {
        int height = doLayout(QRect(0, 0, width, 0), true);
        return height;
    }
//! [7]

//! [8]
    void FlowLayout::setGeometry(const QRect &rect) {
        QLayout::setGeometry(rect);
        doLayout(rect, false);
    }

    QSize FlowLayout::sizeHint() const {
        return minimumSize();
    }

    QSize FlowLayout::minimumSize() const {
        QSize size;
        for (const QLayoutItem *item: qAsConst(itemList))
            size = size.expandedTo(item->minimumSize());

        const QMargins margins = contentsMargins();
        size += QSize(margins.left() + margins.right(), margins.top() + margins.bottom());
        return size;
    }
//! [8]

//! [9]
    int FlowLayout::doLayout(const QRect &rect, bool testOnly) const {
//        LOG_INFO("dolayout:"<<itemList.size())
        int left, top, right, bottom;
        getContentsMargins(&left, &top, &right, &bottom);
        QRect effectiveRect = rect.adjusted(+left, +top, -right, -bottom);
        int x = effectiveRect.x();
        int y = effectiveRect.y();
        int lineHeight = 0;
//! [9]

//! [10]
        for (QLayoutItem *item: qAsConst(itemList)) {
            const QWidget *wid = item->widget();
            int spaceX = horizontalSpacing();
            if (spaceX == -1)
                spaceX = wid->style()->layoutSpacing(
                        QSizePolicy::PushButton, QSizePolicy::PushButton, Qt::Horizontal);
            int spaceY = verticalSpacing();
            if (spaceY == -1)
                spaceY = wid->style()->layoutSpacing(
                        QSizePolicy::PushButton, QSizePolicy::PushButton, Qt::Vertical);
//! [10]
//! [11]
            int nextX = x + item->sizeHint().width() + spaceX;
            if (nextX - spaceX > effectiveRect.right() && lineHeight > 0) {
                x = effectiveRect.x();
                y = y + lineHeight + spaceY;
                nextX = x + item->sizeHint().width() + spaceX;
                lineHeight = 0;
            }

            if (!testOnly)
                item->setGeometry(QRect(QPoint(x, y), item->sizeHint()));

            x = nextX;
            lineHeight = qMax(lineHeight, item->sizeHint().height());
        }
        return y + lineHeight - rect.y() + bottom;
    }

//! [11]
//! [12]
    int FlowLayout::smartSpacing(QStyle::PixelMetric pm) const {
        QObject *parent = this->parent();
        if (!parent) {
            return -1;
        } else if (parent->isWidgetType()) {
            QWidget *pw = static_cast<QWidget *>(parent);
            return pw->style()->pixelMetric(pm, nullptr, pw);
        } else {
            return static_cast<QLayout *>(parent)->spacing();
        }
    }

    void FlowLayout::insertWidget(int index, QWidget *wid) {
        this->addWidget(wid);
        itemList.move(itemList.size()-1,index);
//        auto *item = new QWidgetItemV2(wid);
//        itemList.insert(index, item);
    }
//! [12]
}
